Abstract In this work, the frequency dependences of complex piezoelectric, dielectric, and elastic parameters of lead-free ferroelectric ceramics based on solid solutions of the (Na, Li)NbO3 system were studied in the frequency range up to 100 MHz. A complete set of complex parameters of lead-free ferroelectric ceramics was measured using the PRAP automatic iterative method. It was shown that the studied lead-free ferroelectric ceramics are characterized by low attenuation of ultrasonic waves and lack of dispersion in a wide frequency range, and can be used in high-frequency ultrasonic transducers for medical and nondestructive testing equipment.

中文翻译：

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无铅铁电陶瓷复常数的频率相关性

摘要 在这项工作中，研究了基于 (Na, Li)NbO3 系统固溶体的无铅铁电陶瓷的复杂压电、介电和弹性参数在高达 100 MHz 的频率范围内的频率依赖性。采用PRAP自动迭代法测量了一套完整的无铅铁电陶瓷复杂参数。结果表明，所研究的无铅铁电陶瓷具有超声波衰减小、在较宽频率范围内无色散的特点，可用于医疗和无损检测设备的高频超声换能器。